DEFINED BENEFIT PENSION EXPENSE (Details) - Summary of Defined Benefit Pension Expense - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Interest cost	$ 2,080	$ 2,207	$ 4,160	$ 4,414
Expected return on plan assets	(2,916)	(2,932)	(5,832)	(5,864)
Amortization:
Prior service cost	4	4	8	8
Recognized actuarial loss	591	541	1,181	1,082
Net periodic expense (income)	$ (241)	$ (180)	$ (483)	$ (360)